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@uiten tats garant @Hita IMPROVEMENT IN FRIGTIN-PAWL.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOSEPH MOORE, of the city of San Francisco, San Francisco county, State of California., have invented a certain new and improved Friction-Pawl; and I do hereby declare the following description and accompanying drawings are suilicient to enable any person' skilled in the art or science to which it most -nearly appertains to make and use my'said invention without further invention or experiment.

The nature of my invention is the use of a friction-clutch and pawl in connection with a hoisting-gear, in

order to guard against accidents, and to prevent a backward motion ofthe load without any manipulation of the brake, so constructed that the hoisting-wheel may be turned easily in a direction to raise the weight, while, by means of pawls inside of the ratchet-case, and frictional brake-beams, the load may he stopped at any point with perfect safety.

To more fully explain my invention, reference is hadto the accompanying drawings, forming a part of this specification, of which-'- i o Figureill represents a side elevation, with section of gears and hoisting-wheel.

Figure 2, an end elevation. i i

Figure 3, a side view of pawls and ratchet-case.

Figure 4, a sectional view of the same.

Similar letters indicate like parts in cach of the figures.

A is a hoisting-drum, which extends across the hatchway, (if applied to hoists in stores,) and may be of wood or iron; C C are bea-rings, upon which the drum A revolves; D is a gear fastened to the drum A; E E E `are posts supporting the drum-bearings; F is a small shaft, upon which are fastened the pinion G, rope-wheel K, and friction-clutch R. Upon the drum A spiral grooves are made, running from right to left on one side, and' left to right on the other, of the centre, to which drum` there is attached a chain or rope, fastened at both ends to the drum, with a pulley, M, in a 'line below the middle of it, to which is hung a Cage, N, sliding in grooves in the usual manner. The friction-pawl is composed of the centre hub O, keyed fast to the shaft, with three er more recesses P P P te receive pawls, which catch in teeth on the outer or friction-ring R. Ris a case with outer ring, as shown in the drawings, having one side solid, with hub made wide, and bored to size of shaft F, and upon which it is inade to revolve loosely, with the least possible friction. The inside of the case R is a round plate fitted against said case, and covering in the pawls Q, preventing them from falling out, also supplying additional bearing to the case on shaft F. The case is so constructed, that, when put together with the hub keyed on the shaft, the pawls set in their places, and the outer langebolted up against the side of case, the outer rim or case R can be revolved in the direction in which the pawls point, while the sha-ft F is kept stationary, ljut cannot be turned the reverse way on account of the pawls catching ythe teeth of the case ahd preventing its revolving without revolving the shaft with it. The case R is prevented from revolving by two brakes hung upon the pins S S, and reaching beyond the friction-clutch sufficient to allow a'hcnt lever, T, hung upon a pin, U, and acting upon the two brake-beams L L through the rod V, by the weight Z.

The action of my machine is as follows :A A. load is put upon the cage entraine N, and by means of an endless rope over V, pulley K, the` shaft- F is made to revolve, giving motion through the gear Gto D, thereby turning tlic drum A irl-the direction for hoisting, causing the chain or rope to wind on the drum from both ends toward the centre, and so calculated to the height as to meet in the middle when the enge is-at the top. During the time it has been hoisting` the weight Z, acting through thc lever T, on brake-beamsl L L, have held the case It stationary, and allowed the shaft to turn the hub O in the direction in which the pawls were free; but immediately the strain was taken off the hoisting side of the rope on V, wheel K, the weight upon the cage N would cause the drum A to revolve the reverse way, communicating the motion through the gears I) and G to the shaft and huh O, and immediately cause the pnwls Q, to catch in the rim oicase of friction-clutch Ii., which being held stationary by means of the friction of the brake-beams L L, the whole machine is brought to a stand-still, and yet without any additional action of the hoisting power. The weight- Z is made heavy enough to sustain the heaviest wright the machine is to work to, so that in hoisting or lowering the cage N can he left standing at any stoppingplace or iloor with perfect safety. When it is desired to' lower the load, all that is necessary is to lift up the weight Z, when the machine will immediately reverse, by the rim or ease R slipping round or revolving between the brzrkefbcems L L, following the eluehes or pawls Q, to revolve with the rim R. Having thus clescribml` my invention, what; I claim, sind desire to secure by Letters Patent, is- A stop fippnrntusfor hoisting-innehinery, constructed with the pawls Q Q Q, moving with the shaft F and the ratchet-ease R turning loosely upon said shaft, together with the bmke-beams L li, levers T and V, and

s weight Z, constructed and operated substantially :is :rnd for the purpose described.

In witness whereof` I have hereunto setmy hand umlsenl. i

` JOSEPH MOORE. [1..

Witnesses:

Gno. ll. STRONG, C. W. M. SMITH. 

